1880.] MR. W, A. FORBES ON THE UAKARI MONKEYS. 



C39 



other for a very short distance, the frontal and alisphenoid not 

 meetino'. On tlie other hand, in all the New-world iMonkeys' skulls 

 that I have examined, the arrangement above described obtains, ex- 

 cept in some skulls of the genera Mvcefes and Ateles. Thus of five 



Fi£ 



o. 



- f/,m 



Part of side walls of skull of a New- world Monkey (Brachyurus ntbicuudus). The 

 parietal {Pe() and malar (Ma) articulate, as in other members of this group. 



Fis. 6. 



The same parts in an Old-world Monkey {CercopUhccuK inirrhonotus), showing 

 the parietal and malar separated tVom each other by the intervention of 

 the frontal {Fr), alisphenoid {At), and squamosal (.S'j), which are shaded 

 obliquely. 



skulls of the first genus in the Royal-CoUege-of- Surgeons Museum, 

 in one the sutures are invisible on account of age, whilst in the 

 remaining four the union takes place in one only on both sides. 



